I ordered this on/off ASA for my gun because I hated the smart parts on off that came stock on my nerve. It took a long time to get this becuase it was out of stock everywhere, when I finally ordered it from action village they didnt include the rail. I returned it and got one off of ebay.

The anno on this pupy is beautiful, matches my nerve perfectly. The milling on the body and knob is very nice.
The rail connects very easy and the ball bearing system makes a much better small rail than similar products (the CIP unimount). I connected it up to my gun with ease (be careful not to loose the ball baering). I lock tited in the included plug, there are two holes to let you choose which side your air hose comes out. I lock tited my macro line fitting and screwed it in, let it dry for 2 hours and played with it this very night.

It didnt leak at all after applying a small amount of red locktite and allowing it to dry, at the field i found that the rail is very easy to activate gas, easy to screw in the knob (unlike my old CIP unimount).

The Best part of this rail on/off is its de-gass feature, you unscrew it and it de gasses the entire marker, no need to shoot out the pressurized air, this is very helpful when teching the gun at the field and improves safety, no way to accidentally shoot anyone.

Conclusion:

Basically, this on/off combo has everything you need, a beautiful rail and ASA which are easy to connect to your gun and set up, and the on/off feature works flawlessly to gas and de-gass your gun without worrying about de-pressurization. If you like a drop forward you should get the ASA alone, it works amazing.